https://ar.copernicus.org/articles/ Combined list of the recent articles of the journal Aerosol Research and the recent discussion forum Aerosol Research Discussions en https://doi.org/10.5194/ar-4-373-2026 Challenges in measuring sticky biogenic ice-nucleating macromolecules Joseph Robinson, Martin I. Daily, Polly B. Foster, Jack P. Macklin, James B. McQuaid, Mark D. Tarn, and Benjamin J. Murray Aerosol Research, 4, 373–396, https://doi.org/10.5194/ar-4-373-2026, 2026 Ice formation in many clouds is initiated by airborne particles, which are often measured by collecting them on a filter and washing them into water for analysis. Using controlled laboratory experiments, we show that some of these particles adhere strongly to the filter and are not recovered. As a result, this common method can underestimate how many ice-forming particles are present in the atmosphere. Fri, 04 Sep 2026 22:44:51 +0200 https://doi.org/10.5194/ar-2026-29 Measurement-Model Closure of Sub-20 nm Particle Charge Fractions under Varying Trace Gas Composition Fabian Schmidt-Ott, Robert Nishida, Sebastian Schmitt, Jason Olfert, George Biskos, and Juha Kangasluoma Aerosol Research Discuss., https://doi.org/10.5194/ar-2026-29,2026 Preprint under review for AR (discussion: open, 0 comments) Typical MPSS measurements rely on bipolar diffusion charging, where the steady-state particle charge distribution depends on charger ion properties. By simultaneously measuring ion properties and particle charge fractions, we show that Hoppel&Frick theory accurately describes charging of sub-20 nm particles. By introducing siloxanes via outgassing from conductive silicone tubing, we further show that ion properties, and thus particle charge distributions, are sensitive to trace-gas composition. Tue, 04 Aug 2026 22:44:51 +0200 https://doi.org/10.5194/ar-2026-28 Contributions of Fine and Coarse Particles to Light Absorption at an Urban Traffic Site during Street Dust Season Luis M. F. Barreira, Delun Li, Jussi Hoivala, Minna Aurela, Aki Virkkula, Jarkko V. Niemi, Hanna E. Manninen, Topi Rönkkö, Hilkka Timonen, and Sanna Saarikoski Aerosol Research Discuss., https://doi.org/10.5194/ar-2026-28,2026 Preprint under review for AR (discussion: open, 1 comment) Urban street canyon measurements during spring showed that submicron particles (PM1) dominated light absorption and black carbon from traffic exhaust, while coarse particles (PM2.5–PM10) became important during dust resuspension events. Size-resolved optical and chemical analyses revealed strong source-dependency, with coarse fractions influencing absorption metrics and source apportionment, especially during street dust events, which highlighted the importance of selected particle size cut-off. Fri, 24 Jul 2026 22:44:51 +0200 https://doi.org/10.5194/ar-2026-25 Assessment of cabin filtration efficiency: contribution to an on-road methodology Ambre Delater, Sébastien Fable, Brice Berthelot, Cécile Raventos, Jessica Queron, Isabelle Coll, and Olivier Le Bihan Aerosol Research Discuss., https://doi.org/10.5194/ar-2026-25,2026 Preprint under review for AR (discussion: final response, 2 comments) Currently, the performance of automotive cabin filtration systems is assessed in laboratories, but this does not take into account all real-world parameters, such as weather conditions. To complement these studies, we evaluated the performance of two cabin filters in a moving SUV in Paris. This protocol was applied to 2 different filters, revealing differences in their filtration performance. This protocol could help researchers to understand the mechanisms of aerosol filtration in cars. Tue, 21 Jul 2026 22:44:51 +0200 https://doi.org/10.5194/ar-4-345-2026 From seeding to detachment: leveraging deep learning to quantify the transport of tyre wear microplastics in a wind tunnel Bashir Olasunkanmi Ayinde, Wolfgang Babel, Johannes Olesch, Daniel Wagner, Seema Agarwal, Christian Laforsch, Julian Brehm, Anke Nölscher, and Christoph Karl Thomas Aerosol Research, 4, 345–372, https://doi.org/10.5194/ar-4-345-2026, 2026 The dynamics of how tyre wear particles behave prior to their entrainment are still poorly understood. In wind tunnel experiments, the particle detachment from an idealized glass substrate was monitored. For particle sizes above 80 μm, smaller and more rounded particles were mobilized by wind shear first, whereas larger and more angular particles require stronger wind shear, highlighting strong surface adhesion and particle morphology as the major factors influencing microplastic detachment. Mon, 20 Jul 2026 22:44:51 +0200 https://doi.org/10.5194/ar-4-311-2026 Size distribution and particle morphology of analytes dried through the evaporative light scattering detector – Part 1 Frederick Bertani, Joshua Hassim, and Simone Hochgreb Aerosol Research, 4, 311–323, https://doi.org/10.5194/ar-4-311-2026, 2026 This paper presents the very first measurements of droplet and particle sizes and concentrations through the parts of an elastic light scatter detector. Measurements were made using two instruments, phase Doppler particle anemometry and an aerodynamic aerosol classifier, to resolve the size distribution of volatile particles upstream and dried particles downstream. The final measurements are used in a companion paper comparison with simulations. Wed, 15 Jul 2026 22:44:51 +0200 https://doi.org/10.5194/ar-4-325-2026 Simulation of aerosol transport, evaporation and scattering in the Evaporative Light Scattering Detector – Part 2 Frederick Bertani, Joshua Hassim, and Simone Hochgreb Aerosol Research, 4, 325–344, https://doi.org/10.5194/ar-4-325-2026, 2026 The paper presents a model for the atomization and evaporation of a stream of solvents containing less volatile analytes through a system, designed to detect the final dried particles using elastic scatter, called elastic light scatter detector. The results of simulations of the total particle concentrations, as well as the final light scattered signals, are compared to experiments for validation. This is the first set of simulations of this detection device. Wed, 15 Jul 2026 22:44:51 +0200 https://doi.org/10.5194/ar-4-293-2026 Exploring ice nucleation particle concentrations in a boreal environment: limits of machine-learning-assisted variable screening Yusheng Wu, Zoé Brasseur, Dimitri Castarède, Paavo Heikkilä, Jorma Keskinen, Ottmar Möhler, Markku Kulmala, Tuukka Petäjä, Erik S. Thomson, and Jonathan Duplissy Aerosol Research, 4, 293–309, https://doi.org/10.5194/ar-4-293-2026, 2026 Clouds in cold regions affect climate and precipitation, but their behavior depends on rare airborne particles that help ice form. We measured these particles over several months in a Finnish forest and compared them with many environmental observations. We found that ice formation in winter was largely unpredictable, while in spring and summer it was more strongly linked to particle amount and composition. This shows that local conditions are needed to better represent clouds in climate models. Thu, 09 Jul 2026 22:44:51 +0200 https://doi.org/10.5194/ar-4-279-2026 Soot growth by monodisperse particle dynamics coupled with computational fluid dynamics Arash Fakharnezhad, Joseph D. Berry, and Eirini Goudeli Aerosol Research, 4, 279–291, https://doi.org/10.5194/ar-4-279-2026, 2026 A computationally efficient monodisperse particle dynamics–computational fluid dynamics simulation is developed to predict soot particle growth in flames without use of reaction kinetic models. The proposed model is in good agreement with soot volume fraction and mobility size measurements, demonstrating a level of accuracy comparable to that of sectional models. This model can be readily used for design applications of engines and industrial burners. Mon, 06 Jul 2026 22:44:51 +0200 https://doi.org/10.5194/ar-4-265-2026 Nascent titanium-/silicon-containing particle formation in corona-discharge-assisted combustion Chanakya Bagya Ramesh, Frank Daoru Han, and Yang Wang Aerosol Research, 4, 265–277, https://doi.org/10.5194/ar-4-265-2026, 2026 We have attempted for the first time to elucidate the mechanism of inorganic particle formation and growth in sub-10 nm size. Results show that by introducing corona discharge into a flame, based on precursor concentration, we can either promote or suppress particle formation and growth. This can help better understand the effect of plasmas on combustion synthesis of nanoparticles. Wed, 01 Jul 2026 22:44:51 +0200 https://doi.org/10.5194/ar-2026-24 Mixing state of Carbonaceous Aerosol Emissions from an Ecodesign Woodstove Zixuan Cheng, Doğuşhan Kılıç, Daniel Wilson, Amanda Lea-Langton, Michael Flynn, Leonard Kirago, Marvin Shaw, Andrew Rickard, Jim R. Hopkins, Daniel Bryant, Gordon McFiggans, Jacqueline F. Hamilton, Hugh Coe, and James Allan Aerosol Research Discuss., https://doi.org/10.5194/ar-2026-24,2026 Preprint under review for AR (discussion: final response, 2 comments) Wood burning is seen as cleaner in modern stoves, but user behaviour can change this when burning dry wood. We burned dry ash wood in a UK modern stove with six common operations and measured the wood smoke. Reloading while hot, using too much or too little wood, or opening the stove door increased small particels and harmful smoke emissions. We found a burning stage that helps explain these emissions. Using big pieces of wood and following guidance can reduce pollution and health risks. Tue, 30 Jun 2026 22:44:51 +0200 https://doi.org/10.5194/ar-2026-23 Role of Methanesulfonic Acid in Freshly Nucleated Particle Formation and Growth Galib Hasan, Yosef Knattrup, Haide Wu, and Jonas Elm Aerosol Research Discuss., https://doi.org/10.5194/ar-2026-23,2026 Revised manuscript under review for AR (discussion: final response, 5 comments) New atmospheric particles affect air quality and climate but the molecular processes behind their formation remain poorly understood. We used computer simulations to investigate how two common atmospheric acids interact with ammonia and amines during the earliest stages of particle formation. We found that sulfuric acid plays the dominant role in forming the smallest particles, while methanesulfonic acid contributes mainly during later growth helping to clarify their roles in the atmosphere. Wed, 24 Jun 2026 22:44:51 +0200 https://doi.org/10.5194/ar-4-255-2026 An intercomparison study of optical particle size spectrometers for aerosol number size distribution measurements Sébastien Bau, Vincent Crenn, Joris Leglise, Sébastien Jacquinot, Christophe Debert, Denis Petitprez, Valentine Bizet, Lara Leclerc, Alain Miffre, Danael Cholleton, Alec Rose, Alexandre Tomas, Amel Kort, Didier Hebert, Aurélie Joubert, Florence Deschamps, Sébastien Ritoux, Lyes Ait Ali Yahia, and François Gaie-Levrel Aerosol Research, 4, 255–264, https://doi.org/10.5194/ar-4-255-2026, 2026 This study reports on an inter-laboratory comparison to assess particle number size distributions of three test aerosols using 35 optical particle size spectrometers from 16 partners over 40 weeks. Most measurements clustered near the control, confirming that such devices generally provide reliable size distributions. Calibration history, size resolution, particle morphology, and differences in refractive index between calibration and test aerosols are part of the biases observed. Fri, 19 Jun 2026 22:44:51 +0200 https://doi.org/10.5194/ar-2026-22 Inhalation of small particles (PM2.5) in urban road tunnels and underground Madrid (Spain). A citizen science project Angel Lopez-Encuentra, Esther Gil Cid, and Luis Miguel Pozo Coronado Aerosol Research Discuss., https://doi.org/10.5194/ar-2026-22,2026 Preprint under review for AR (discussion: open, 1 comment) In road tunnels and the metro, there are small toxic airborne particles (PM2.5). In Madrid (Spain), there is no public information on PM2.5 in these infrastructures. One alternative is for citizen scientists to use validated low-cost sensors. Data from these sensors were compared with reference station data; their correlation was high. PM2.5 levels in Madrid’s tunnels and metro exceed 10 µg/m³ and are above the 2011 World Health Organization guideline Fri, 12 Jun 2026 22:44:51 +0200 https://doi.org/10.5194/ar-4-211-2026 Numerical study of the collection of aerosol particles by falling deformable drops Thibaut Ménard, Emmanuel Reyes, Wojciech Aniszewski, Pascal Lemaitre, and Emmanuel Belut Aerosol Research, 4, 211–229, https://doi.org/10.5194/ar-4-211-2026, 2026 This study uses advanced computer simulations to explore how falling water drops remove airborne particles. It shows that, when drops deform and oscillate, their motion strongly affects how efficiently aerosols are captured. The model accurately predicts drop speed and shape, but capture rates can differ from experiments by up to an order of magnitude. These gaps likely stem from missing physical effects (evaporation), uncertainties in aerosol measurements, and numerical inaccuracies. Thu, 11 Jun 2026 22:44:51 +0200 https://doi.org/10.5194/ar-4-231-2026 Assessing the sources of submicron airborne elements at two sites in the Fos-Marseille basin through rolling positive matrix factorization Mathilde Brezins, Benjamin Chazeau, Nicolas Marchand, Amandine Durand, Grégory Gille, Romain Bourjot, Andre S. H. Prévôt, Jean-Luc Jaffrezo, Gaëlle Uzu, and Barbara D'Anna Aerosol Research, 4, 231–254, https://doi.org/10.5194/ar-4-231-2026, 2026 The Marseille–Fos basin faces high anthropogenic pressure from industry and maritime and road transport combined with specific weather conditions that further degrade air quality. Our study focuses on fine metallic pollution, which can penetrate deep into the lungs and cause harmful effects. Using 1 year of measurements at two sites, we identified 10 main pollution sources, half directly linked to human activities, highlighting clear risks for the environment and public health. Thu, 11 Jun 2026 22:44:51 +0200 https://doi.org/10.5194/ar-2026-20 Look−up tables for complex refractive index correction of particle sizes measured by common research−grade optical particle counters Paola Formenti and Claudia Di Biagio Aerosol Research Discuss., https://doi.org/10.5194/ar-2026-20,2026 Revised manuscript accepted for AR (discussion: closed, 3 comments) This study improves the accuracy of optical particle counters (OPCs), instruments used to measure airborne particles important for air quality and climate research. Because OPC measurements depend not only on particle size but also on composition and shape, results can be uncertain. The paper provides a standardized database of correction factors for five commercial OPCs, helping researchers produce more reliable and consistent aerosol measurements across a wide range of atmospheric conditions. Thu, 11 Jun 2026 22:44:51 +0200 https://doi.org/10.5194/ar-2026-19 In vitro toxicity of CNG exhaust gases and particles generated under varying driving conditions Georgios Tsakonas, Rodopi Stamatiou, Ilias Vouitsis, Athanasios Besis, Athanasios Kouras, Daniel Deloglou, Eleni Papaioannou, Karine Elihn, Constantini Samara, Antigone Lazou, and Zissis Samaras Aerosol Research Discuss., https://doi.org/10.5194/ar-2026-19,2026 Preprint under review for AR (discussion: open, 0 comments) Exhaust from a Euro 6 compressed natural gas taxi was tested under simulated real-world driving, including different driving dynamics and operating conditions. Diluted exhaust was used to expose human lung cells. Although particle mass was low, cell viability was reduced, cell damage was increased, and inflammatory responses were triggered. The findings show that health relevance depends on several emission properties, not particle mass alone. Wed, 03 Jun 2026 22:44:51 +0200 https://doi.org/10.5194/ar-2026-21 The influence of hydrogen addition on carbonaceous aerosols produced by an ethylene flame Stijn S. A. van Rijn, Haiyan Ni, Martijn A. R. Goudberg, Merel R. van Helten, Anatoli Mokhov, and Ulrike Dusek Aerosol Research Discuss., https://doi.org/10.5194/ar-2026-21,2026 Preprint under review for AR (discussion: final response, 2 comments) Combusting hydrogen alongside carbon-based fuels has been proposed to reduce CO2 emissions. In this work, we investigate how this affects the emitted particles, using a model flame. Increasing hydrogen leads to smaller particles containing a higher of organic material and less of the of the strongly light absorbing elemental carbon. However, the organic material shows considerable light absorption at shorter visible wavelength and in the UV. Tue, 02 Jun 2026 22:44:51 +0200 https://doi.org/10.5194/ar-4-189-2026 Impact of agricultural interventions on ammonia emissions and on PM2.5 concentrations in the UK: a local and regional modelling study Matthieu Pommier, Robert Benney, Jamie Bost, Becky Jenkins, Joe Richardson, Liam Rock, Olivia Blythe, Oliver Marshall, and Alexandra Spence Aerosol Research, 4, 189–210, https://doi.org/10.5194/ar-4-189-2026, 2026 This study examines NH3 emissions from UK agriculture and the role it plays in PM2.5 formation, focusing on the dairy, pig, and poultry sectors. Using regional and local air quality models, we find that a 13 % NH3 reduction cuts PM2.5 by only ~1 % due to NH3-rich air. The regional model may underestimate PM2.5, while the local modelling shows that emissions disperse within 700 m. The study highlights the value of combining models to better understand the spread of pollutants and to improve PM2.5 control strategies. Thu, 21 May 2026 22:44:51 +0200